Window-lifting mechanism



Jam 27. 1925 v A. WATKINSON ET AL WINDOW LIFTING MECHANISM Filed June 21, 1923 2 Sheets-Sheet 2 llll @W @m 22 3, Mzww Patented Jan. 27, 1925v UNITED STATES PATENT OFFICE...

ARTHUR WATKINSON, 0F ACTON, LONDON. AND CHARLES EDWIN HARRISON, OF

HAR-LESDEN, LONDON, ENGLAND, .ASSIGNORS TO BECKETT, LAYCOCK & WATKIN- SON LIMITED, 01? LONDON, ENGLAITLD, A BRITISH COMPANY.

WINDOW-LIFTING MECHANISM.

T 0 all @072 out it may concern:

Be it known that we, ARTHUR WATKIN- son, a subject of the King of England, residing at Acton, London, England, and CHARLES EDWIN Hsnmeon, a subject of the King of England, residing at Harlesden, London, England, have invented certain new and useful Improvements in VVindow- Lifting Mechanisms, of which the following'is a specification.

This invention is for improvements in or relating to window-lifting mechanisms, and has for its object to provide an improved construction of the same which is particularly suited for use with windows in which it is desired to adjust the window up and down by means of mechanism concealed in the wall below the window; such mechanisms are commonly used on motor-cars and other vehicles.

According to this invention there is provided in window-lifting mechanism, the combination of a rotatable screw threaded spindle which is arranged with its axis parallelwiththe direction in which the window is to be-moved,}a nut that can be traversed aforesaid takes the formof a double parallelogram expanding-linkage, comprising two long links which are pivoted together at the middle of their lengths, with their respective freeendseach jointed to a shorter link, said shorter links being connected together in pairs to constitute closed parallelograms withhalves ofthe longer links; with such a linkage,the invention comprises the combination of a supporting frame, a screwthreaded spindlerotatably mounted thereon, and means for rotating it, a nut on said spindle, and the expanding linkage aforesaidhaving one end anchored to the frame beside the spindle, its middle point connected to'the nut and its other end adapted to be connected to the window'that'isto be moved.

@their features of the invention will be de- Application filed June 21,

1923. Serial No. 646,971.

scribed with reference to specific embodiments of it Which are illustrated in the accompanying drawings.

In these drawings- Figure 1 is a front elevation of the complete mechanism;

Figure 2 is a side elevation of Figure 1, partly in section, looking from the left-hand side;

Figure is a front elevation of a modified construction; and

Figure 4 is a detail.

Like reference characters indicate like parts throughout the drawings.

Figures 1 and 2 show a construction of lifting mechanism suitable for use with'the vertically-sliding windows of a motor vehicle. A suitable frame 10 is built up of angleor sheet-metal, and is provided 'near the top and bottom with bearings 11, 12, 13 for a screw-threaded spindle 14. The end thruston the spindle is taken by a centrallysituated ball 15 at the bottom, and a pointed pin at the top, or any other convenient bearings may be used.

Near its upper end the spindle 14 carries a worm-gear 16 which meshes with a :hand operated worm-gear 17, thislatter gear being mounted in suitable bearings in' the frame 10, and provided with means whereby it may be rotated manually, as for example by means: of a handle secured on its spindle 18. Upon the spindle 14 there is mounted a nut-like member 19 which is preferably made in two parts, the nut proper 19, and a guide-sleeve 20. These two parts are secured in aicasing 21-:andthe sleeve 20 bears. upon the tops of the threads of the spindle 14 to serve as aguide preventing the nut 19 from tilting and binding upon the thread.- V V The nut 19 carries a pivot-pin 22 whereon are mounted two links 23, 24, each pivoted on the pin 22 at the middle of its length. These links are connected at'ione end, the lower end in Figure 1 by means of short links 25, 26 respectively, to a pivot-pin 27 secured in the frame 10, at one side of the spindle 14 and at about the middle of the height of that spindle or slightly lower, and the links are so proportioned as to constitute a closed parallelo in, Qlhe other or upper ends of the links 23, 2 1 are similarly connected by shortlinks 28, 29 which are themselves pivoted together at 30 to a bracket 31. his bracket 31 carries or is secured in any convenient manner to the window which is to be raised and lowered, the bottom rail of this latter being indicated diagrammatically at 32.

As shown in Figures 1 and2, the pivotpin 30 is directly connected to the bracket 31, but if desired the construction illustrated in Figure 4 may be used. In this case the pivot-pin 30 engages the bracket 31 by means of a slot 33, and a spring 34 is interposed between the bracket and the pivotpin to serve as a shock-absorber. The spring 34 is conveniently V-shaped with its two upper ends engaging the bracket 81 and its central portion suitably curved to engage the pivot-pin 30 or a bush thereon.

In the operation of this mechanism'the spindle 14: is rotated through the gears 17 mounted on the centre line of the window, 7

'22 but is greater in extent.

16, and'the nut 19 is thereby traversed up or down the spindle. It thereby carries the middle point of the double-parallelogram linkage upwards or downwards in a straight line, and since the lower end of the linkage is held stationary on the pivot-pin 27, the free end 30 of the linkage has a movement which is similar to that of the middle point If the short links 25, 26, 28, 29 are half the length of the long links, the movement of the free end 30 is double that of the mid-point 22.

Since the mid-point 22 moves in a straight line along the spindle the free end 30 also moves in a straight line which is parallel with the axis of the spindle 14 and it is the movement of the bracket 31 which is imparted to the window 32.

Among the advantages of this invention it may be pointed out that the whole mechanism is built as a unit on the frame aforesaid so that it can be readily fitted in any desired situation. The thrust on the window to raise or lower it is always applied directly in the line of the movement of the window, so that there is no tendency for the latter to jam, and its correct alignment 'ismain tained. The velocity ratio of the mechanism is the same throughout its range of movement, or, 1n other words, any given movement of the operating handle always raises the window by the same amount. Conveniently, the operating handle is and this enhances the appearance although 'it obviously makes no difference to the mechanism, since the gear-wheels can be selected'of any suitable size according to the relative positions of the various parts.

There is illustrated in Figure 13 a modilfi'ed construction of this invention which is particularlyapplicable for. use with a wide Window. The mechanism is similar to that peated in the movement of another 3. In window-lifting The upper or free ends of these linkages are both connected to the window 40 which is required to be raised and lowered. Since the arrangement is symmetrical. the move ments of the two linkages of Figure 3 are identical. In the construction illustrated in Figure 1, the fixed pivot of the linkage is situated to one side of the 321th of movement of the central point oi the linkage, and the same condition is fulfilled in Fig ure 3, so that in both cases the advantage is obtained that the middle point of the linkage can be traversed between points above and below the fixed point. A considerable saving in the overall height of the mechanism is thereby obtained, since the window can be lowered until the bracket 31 reaches the bottom member of the frame 10.

Whilst a specific form of linkage has been described, it is to be understood that the invention is not limited to this arrangement, since any form of pantagraph link- 7 age in which the movement of one point of the linkage is simply magnified and reoint, can be used, and these and other mo ifications in the details of construction are all held to be covered by the present invention.

What we claim as ourinvention and desire to secure by Letters Patent is 1. In window-lifting mechanism, the combination of a rotatable screw-threaded spindle-arranged with its axis parallel with 'the direction in which the window is to he moved, a nut adapted to be travelsed longitudinally of the spindle, and. a pantagraph linkage having its fixed point situated to one side of the spindle between the ends thereof, one moving point engaged with said nut and its other moving point for engagement with the window that is to be moved.

2. In window-lifting mechanism, the combination of a rotatable screw-threaded spindle which is arranged with its axis parallel with the direction in which the window is to be moved, a nut that can be traversed longitudinally on the spindle, and a pantagraph or equivalent linkage'having one moving point engaged with said nut, its fixed point situated to one side and about level with the middle of the length. of the path of said moving 'point, and its other moving point for engagement with the window that is to be moved.

mechanism, the combination of a supporting frame, a screw,

threaded spindle rotatably mounted therein, means for rotating said spindle, a nut on said spindle, and a double-parallelogram expanding-linkage having one end anchored to the frame laterally of the spindle, its middle point connected to the nut, and its other end adapted to be connected to the window that is to be moved.

l. In window-lifting mechanism, the combination of a rotatable screw-threaded spindle arranged with its longitudinal axis parallel with the direction in which the window is to be moved, a nut whereof one portion only is threaded on the spindle and the remaining portion is a sliding fit on the top of the threads of the spindle, and a pantagraph linkage having one moving point engaged with said nut and its other moving point for engagemnt with the window that is to be moved.

5. In window-lifting mechanism, the combination with a rotatable screw-threaded spindle arranged with its longitudinal axis parallel with the direction in which the window is to be moved, a nut movable along the spindle. and a pantagraph linkage having one point engagd with said nut, of a bracket having a vertical slot for attachment to the window, a pin carried by the other moving point of said linkage and movable in said slot, and a spring carried by said pin and supporting said bracket thereon.

6. lVindow-lifting mechanism comprising in combination a substantially rectangular vertical frame, a vertical screwthreaded spindle journaled on the ends of the frame, a nut threaded on the spindle, which nut has a guide sleeve, cooperating with the spindle, a lazy-tongs linkage having one end pivoted on a side member of the frame, one moving point engaged with said nut, and its other moving point for engagement with the window that is to be moved.

7. Window-lifting mechanism comprising in combination a substantially rectangular vertical frame, a vertical screwthreaded spindle journaled on the ends of the frame, a nut threaded on the spindle, a lazy-tongs linkage having one end pivoted on a side member of the fame, and one moving point engaged with said nut, a window-supporting bracket having a vertical slot, a pin movable in said slot and engaging the other moving point of said linkage, and a spring supporting said bracket on said pin.

In testimony whereof we have signed our names to this specification.

ARTHUR VVATKINSON. CHARLES EDWIN HARRISON. 

